Thank you for reaching out to us!
This error can occur for various reasons, most commonly choosing a different name for the tenant, either just a character difference or another region if applicable, should allow you to complete the tenant creation. I can also advise that you wait a couple of minute, clear your browser’s cache data and try one more time afterwards.
Let us know if you were able to complete the tenant creation after trying slightly different names for your tenant, or if you continue to experience this issue.
Best regards,
Gerald